/* badswap.c */
#include<stdio.h>
void swap(int a, int b);

main()
{
  int x = 12, y = 24;
  printf("x = %d  y = %d\n", x, y);
  swap(x, y);
  printf("x = %d  y = %d\n", x, y);
}
 
void swap(int a, int b)
{
  int temp;
  temp = a;
  a = b;
  b = temp;
}